Question 1083495
P=Po(1+(r/t))^nt
15000(1+.08/2)^4, divide the interest rate by 2 for the compounding, and multiply the number of compoundings by 2 because semiannual.
=$17547.88
Now use that for 9% compounded monthly
P=17547.88(1+(.09/12))^48, the 48 being 12 monthly compoundings for 4 years: $25,228.13, rounding at the end.  MATURITY VALUE
The interest earned:
first two years: $2547.88
Total: $10,228.13-$2547.88 earned in two years=
7680.25 earned in last four years
TOTAL INTEREST IS $10228.13
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Do it for one year
(1+(.048/12))^12=1.04907
(1+.05/4)^4=1.05094
The second one, at 5% every 3 months.